The alternator in my GMC Sierra was making a loud whistling whining type noise yesterday so I replaced it earlier today and I thought it was fixed but the new alternator has started to make the same noise. It seems kind of unusual that that 2 alternators could be bad in two days.Is there something else that could be causing this. Both alternators are Delco units and my truck is a 1995 with a 5.7 . Any help would be appreciatted, Thanks, Phil Wolf ps. the noise is not constant, and it seems to disappear when accellerating most of the time
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18 years ago